Of course, JohnnyBoy! How stupid of me. I forgot to look in the Sound section of System Preferences AFTER plugging in the dongle. Once plugged in, it is listed and I can select it. Seems to work well. Many thanks for the quick reply.

Downloaded and installed Audacity (Intel release) but can't get it to record from a mic. Using a MacAlly iVoice mic that works perfectly on the Mini in other apps. I read the Audacity help files but maybe I'm still missing something.
Any ideas anyone?

Jazzman, start Audacity with the mic already plugged into your Mac. Then click on "Preferences" under the "Audacity" menu. The first button on the top-left of the Preferences dialogue box will be "Audio I/O". Click that and then change the settings of the "Input" and "Output" drop-down menus._________________Intel Mini 2.0GHz C2D (4GB/120GB/SuperDrive/10.5.8 ), 120GB WD Passport, Logitech ergo k/b
iPod Touch (32GB, 3rd gen), iPod Shuffle (512MB, 1st gen)

Jazzman, start Audacity with the mic already plugged into your Mac. Then click on "Preferences" under the "Audacity" menu. The first button on the top-left of the Preferences dialogue box will be "Audio I/O". Click that and then change the settings of the "Input" and "Output" drop-down menus.